The effect of valence state and site geometry on Cr L3,2 electron energy-loss spectra of Cr-bearing oxidic compounds |
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| Institution: | 1. Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Carl-Zeiss-Promenade 10, D-07745 Jena, Germany;2. Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany;1. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;2. Institute for Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany;1. Friedrich Schiller University Jena, Institute of Geosciences, Applied Geology, Burgweg 11, 07749 Jena, Germany;2. Friedrich Schiller University Jena, Institute of Inorganic and Analytical Chemistry, Environmental Analysis, Lessingstraße 8, 07743 Jena, Germany;3. Helmholtz Centre for Environmental Research – UFZ, Soil Physics, Lysimeter Station Falkenberg, Dorfstraße 55, 39615 Falkenberg, Germany;4. Helmholtz Centre for Environmental Research – UFZ, Water Analytics & Chemometrics, Brückstraße 3a, 39114 Magdeburg, Germany;1. Jeoloji Müh. Bölümü, Müh. Fak., Gümü?hane University, TR-29000 Gümü?hane, Turkey;2. Jeoloji Müh. Bölümü, Müh. Fak., Karadeniz Technical University, TR-61080 Trabzon, Turkey;1. The MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand;2. National Isotope Centre, GNS Science, PO Box 31312, Lower Hutt 5010, New Zealand;3. Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Lower Hutt 5046, New Zealand;4. University of Melbourne, Bio21 Institute, Melbourne, Victoria 3010, Australia;1. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;3. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Helmholtz-Zentrum Potsdam – Deutsches GeoForschungsZentrum, Potsdam, Germany;3. Mekorot Co Ltd., Tel Aviv, Israel;4. Ministry of Water and Irrigation, Amman, Jordan |
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| Abstract: | Chromium L3,2 energy loss near-edge structures (ELNES) of nine chromium compounds were measured in a transmission electron microscope to study the effect of valence state and site geometry of chromium on spectral features. The compounds studied represent a set of standards with given valence state and coordination. The chromium coordination is either octahedral or tetrahedral with different degree of distortion. The distortion of polyhedra results in a loss of the fine detail of spectral features in Cr L3,2 ELNES spectra. The effect of valence state manifests in a systematic chemical shift of the ELNES spectra by about 2 eV per oxidation state for octahedrally coordinated Cr and 0.4–1.4 eV per oxidation state for tetrahedrally coordinated Cr. On the basis of collected Cr L3,2 ELNES spectra we propose a simple quantification technique for the determination of chromium oxidation state in oxidic compounds which is independent of the coordination. |
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| Keywords: | Chromium oxides Chromium-bearing minerals Valence state and coordination of chromium Electron energy loss spectroscopy |
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